Question

A marble tile measures 15 cm by 20 cm. How many tiles will be required to cover a wall of size 6 m by 12 m?

Answer 1

area of each marble =15/100 × 20/100 meter sq


area of wall = 6×12 meter square

no. of marbles = area of wall /area of each
marble
= 6×12×100×100/15 ×20
= 2400 marbles

Answer 2

area of wall=6*12=72m^2
area of marble tile=15/100*20/100=3/100m^2
no of tiles required=
$\frac{area \: of \: wall}{area \: of \: marble \: tile} \\ = 72 \times 100 \div 3 = 2400 \: tiles$